pericardiophrenic artery

noun

peri·​car·​dio·​phren·​ic artery ˌper-ə-ˌkärd-ē-ə-ˈfren-ik- 

: a branch of the internal mammary artery that descends through the thorax accompanying the phrenic nerve between the pleura and the pericardium to the diaphragm